I just started using them for self contained reach in coolers for diagnosing them. Then when the repair happens I remove them and install permanent access stubs with schrader valves. I certainly wouldn't leave them on a unit permanently, though.

When doing a leak search once I passed the sniffer over the bullet valve I just installed and it didn't get any hits. So I can tell you with great certainty that mine didn't leak within the first 30 minutes of me installing it. :grin:

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I prefer the ones you can braze on.

 

If they are properly installed on good tubing they don't leak for a long time. But still; the gasket seal idea has always made me leery. <g>

I have seen them not leak for ten or more years but I still like the idea of installing a brazed on access valves.

PHM
------

 

I agree if the system is flat, use an access stub.

But if you are taping into a charged system and use a tap-

Make sure the line is straight and clean (use a little sandcloth).

Lube the gasket with compatible oil, or nylog.

I have never seen a tap-a-line leak at the valve stem, always around the gasket.

 

Thanks for the replies. It sounds like if I have to recover refrigerant anyways might as well put on a sweat access port

 

They are only good for recovery purposes. Brazen in a stub.

 

Codes of practice say & I quote "2.6.1
Tube piercing or line tap valves and other similar devices must be used only to gain service access to the system in order to remove refrigerant. They must be removed before the completion of service. The system design must not require these valves to be left on the system after the completion of service."

 

If there is a stub, I use a pinch off tool and braze in an access fitting. Re-form the tubing and it is a done deal.

 

Manitowoc actually recommend using a pinch off tool when changing out pressure switches ,, so as not to adjust the factory charge....

So I bought two

 

I was adamant about brazing access valves using crimping tools for years for the reasons already stated by others. But recently I started thinking that it's silly. The only reason those valves leak is either from the inner piece whatever it's called not being in place or the bolts of the bullet valve being loose, or the tubing not being clean etc. I started using them everyday now. It saves a lot of time and cost to the customer. And if the system already has a leak which I can pretty much tell before putting the gauges on anyway, what's the big deal. They go mostly on small cap tube systems anyway. And if the leak is large, on the next call the evap gets replaced or the fridge gets junked anyway. If the cap tube turns out clogged while the torch is out the bullet valve can be removed anyway. I shake my head to my old practices very often as I am getting more seasoned in the trade.

 

I personally believe any system without an access port shouldn't be repaired until a real access port is installed these systems are plentiful but really the manufacturer can't add their own Schrader port for 1$ more???

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nope they can't...$1 is too much lol

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yes but I believe the manufacturers look at it differently rather than their product costing a dollar more they look at they are making 3 million units at a dollar a unit that's 3 million dollars they saved.

 

It has nothing to do with saving a negligible amount of profit per unit. It has to do with service life reliability. Over the service life of your average, well-maintained reach-in, there is no need to access the sealed system. Doing so can be detrimental to the performance of the unit.

 

I use saddle sweat valves, braze on with unit charged, leave perminatly or pinch off/ stub.

 

I have a pinch-of/re-rounding tool that will let me braze a pot onto a stub.

ALL of the units I found that had a low charge had either a legit leak or a leak at a piecing valve. If I take the system apart, it gets a dryer and accesses for future service.

 

That's why the "ice maker" adapter is great.

 

hmm.....u win this time....
lol

 

you guys make a big deal out of this

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Just use the f bullet valve

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